FX LEAK! Which gauge wrench for Panthera/dynamic?

EDIT: super easy FIX! it was the screw on the frame indicated in this thread by Emu https://www.airgunnation.com/threads/air-leaks-fx-panthera-elemination-process.1301858/ removed bottle to relive pressure, tighten screw 2 hours. and we're good! I'm going to leave this hear for future search help/reference

Hunter compact arrived with a leak. I can hear it and I think it’s the top guage. Will try to tighten. Any particular wrench you guys like for these gauges given how close they are to each other?
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